INHERITANCE OF RESISTANCE IN BARLEY TO THE CEREAL CYST NEMATODE, HETERODERA AVENAE

Abstract

The F[sub1], F[sub2] and backcross (BC[sub1] and BC[sub2]) progenies of cross combinations DL 482 x RD 2052 and DL 482 x C 164 were tested against the pathotype-I (Delhi population) of Heterodera avenae. The F[sub1] of both the cross combinations were resistant suggesting that resistance was dominant. In F[sub2], the plants segregated into 3 Resistant: 1 Susceptible ratio thus suggesting a monogenic dominant control of resistance over susceptibility. The backcross (BC[sub1]) with the susceptible parent, DL 482 gave 1 Resistant: 1 Susceptible ratio which confirmed the monogenic dominant nature of resistance in the two barley cultivars 'RD 2052" and 'C 164'. The backcross (BC[sub2]) gave all the resistant plants, further confirming the results obtained in the F[sub2] generation.